Millstone-dressing machine



2 SheetsSheet '1.

(No Model.)

0. S. HOOVER.

MILLSTONE DRESSING MACHINE.

Patented Feb. 6, 1883-.

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2 Sheets-Sheet 2.

(N0 Model.)

0. s. HOOVER. MILLSJQONE DRESSING MACHINE.

Patented Feb. 6,1883.

mine 3 ses Inventor I W Cornelius 815001721 133111 6 \flfiarney W3 fi N, PUERs. PhmmL'rthngrapMr. Wnhin mn. D. C,

UNITED STATES PATENT OFFICE."

CORNELIUS S. HOOVER, OF LANCASTER, PENNSYLVANIA.

MlLLSTONE-DRESSING MACHINE.

SPECIFICATION forming part Of Letters Patent No. 271,849, dated February 6, 1888;. l l application filed November 9, 1882. (No model.) I

- To all whom it may concern:

Beit known thatI, GOnNELrUs S. HOOVER, a citizen of the United States, residing at Lancaster, in the county of Lancaster and State of Pennsylvania,have invented certain new and .useful Improvements in Millstone-Dressing Machines; and I do hereby declare the follow mg to be a fu l, clear, and exact description of the invention, such as will enable-others skilled in the art to which it appertains to make and use the same, reference being had to the accompanying drawings, and to letters or figures of reference marked thereon, which form apart of this specification.

In said drawings, Figure 1 represents aper-' spective View of a diamond millstone-dressing machine embodying my invention. Fig.

'2 represents a longitudinal vertical sectionof the same on aline taken through the adjusting devices for regulating the inclination of the furrows. Fig. 3 represents a detail perspective view ofthe lever and tool-stock hereiuat'ter described. Fig. 4: represents a detail perspective view of a modified form of the upper inclined bar which regulates the transverse inclination andthe form of the furrow.

' Fig. 5 represents a detail view of the movable plate and screws which take up the wear of the slide in its guideway. Fig. 6 represents a detail view of the side bar of longitudinally moving carriage and the devices for taking up wear between it and its guideway, andFig. 7 representsa detail side view of the upper inclined bar and proximate devices.

In the several figures of the drawings the same letters indicate the same parts, respectively. v

This invention relates to diamond millstouedressing machines; and its object is to provide novel means for regulating the out of the tool and the depth and inclination of the furrows, both from end to end and transversely. To effect these objects I employ a vibrating tool, a lever whereby said tool is sustained respects broader than the specific devices hereinafter set forth; but I will describe and illustrate one form of machine embodying my improvements, and will then claim what I consider to be my invention.

In the' accompanying drawings,A designates the bed-plate of the machine, on which is erected a guideway, 13, provided with 1ongitudinal guide-'railsb b, which are grooved to 7 receive the oorrespondingly-shaped frame of the longitudinally-movable carriage G. This carriage is construotedwith a broad flaring middle groove or passage,- which serves as a guideway for the transversely-moving slide D, which is operated in the usual manner by the' feeding-screw E, its cam-toothed wheel F, and the vibrating fingers G, which are attached to standards and arranged to engage withv said wheel and turn it and the screw. The parts thus far referred to and the automatic method of feeding thereby the tool-carrying slide D have been described in my previous patents, and need not be more fully set forth here. 7

As shown in the drawings, the tool overhangs the side of the machine; but it may obviously be extended down through a longitudinal slot made between railsbb of the guideway. The tool holder or stock 11 consists of a disk or block attached to or formed with the lower end of a rod, h, the latter being guided in a block or casting, h, which is formed with or attached to said slide D.

The tool proper consists of a'small cylinder, 1, which sets into a recess in the bottom of 85 said stock, where it is held bya screw, 2'. The diamond is in the lower end of said cylinder I.

The form of tool and tool-holder may, however, be widely varied.

Theupper end of rod his provided with lat- 9o eral studs arranged under the outer end of a horizontal lever, J, of the first kind, the rear end of which is provided with an adjustingscrew, K, which bears on an inclined bar, L.

By turning said screw'in one direction or the 5 other the depth of the diamond may obviously be regulated without affecting any of the other devices. v

The inclination of barL is caused and regulated by an adjusting-screw, M, which works too down through theonter end of said bar against the upper end of a pin, N, the latter being free to move up and down in a vertical passage or aperture of carriage G. This pin rests upon a 5 bar, 0, which sets into a longitudinal recess of guideway B parallel to one of the rails b. Screws P P work up through the bottom of said guideway, at or near the ends thereof, against the bottom of said bar 0. The operation of these adjusting devices is as follows:

' \Vhen the operator desires to regulate the transverse inclination of a furrow he turns the screw M until the outer end of bar L is sufficiently .raised or lowered to give the degree of inclinat5 tion desired. It is obvious that as the slide D is fed automatically across the carriage U the screw K in approaching screw M will rise gradually, following the inclination'of bar L, and carrying the rear or inner end of lever J up with it. This of course will correspondingly depress the operating end of said lever and the tool-holder carried thereby. To regulate the inclination of the furrows longitudinally from skirt to eye, or the reverse, one of the screws P or P is turned so as to raise its end of the movable bar 0, and therebyincline the latter. As the carriage 0 moves along gui'deway B toward the upper end of the incline thus formed, the pin N rides along the 0 top of bar 0, mounting said incline .and correspondingly raising screw M and the outer end of bar L. This of course increases the inclination of said bar L, and thereby causes the tool-stock and" tool to move downward, making a gradually-deepening cut. As the carriagemoves toward the lower end of the inclined bar 0 a replacing-spring, Q, raises the tool-stock and lever to COPIBsPOIld to the downward motion of screw M, pin N, and the .0 outer end of bar L. Thus said tool-holder has a slow longitudinally-reciprocating motion. The latter bar is shown without attachment to the machine, except the clamping action of screws K and M; but any form of attachment may be 5 employed which will allow the necessary action hereinbel'ore described. By varying the shape of the top of bar L a great variety of shape may be given to the furrows. Fig. 4 shows said bar provided with .an undulating 0 upper face for the purpose of giving a similar contour to a furrow on the land between the furrows. When the machine is to be used for the latter purpose the bars L and O are allowed to assume a level instead of an in- 5 clined position, and the tool is then operated in the usual manner. I find it convenient under such circumstances to provide the rear end of lever J with a screw, which will bear on slide 1), thus doing the work of screw K in holding the lever and tool in proper position, but without wear on bar L. Of course other adjusting devices may be substituted for the adjusting-screws-hereinbefore described.

In order to compensate for wear between the carriage O and guide-rails b b, and thereby secure accuracy of fit between them and bar to be moved laterally by horizontal adj ustings-screwsW. Forasimilarpurposetheguideway of slide D is provided with a movable piece, X, which is attached to said carriage by screws :0, that pass through slots 00 therein, said piece being forced against one side of the said slide D by screws Y.

The corresponding faces of the movable and immovable contiguous parts are inclined in both cases, so that the action of said adjusting-screws 'W or Y will tighten the parts properly, and the displacement by vertical motion of the slide or carriage will be effectually guarded against.

The grooves in the guideways may be either external or internal, and the position of the parts V X, which enter said grooves, may of course be similarly varied,

Having thus described my invention, what I claim as new, and desire to secure by Letters Patent, is-

1. In a millstone-dressing machine, a slide and its automatic feeding devices, in combination with a diainond'holder carried" by said slide, a lever arranged to force said diamondholder toward the stone, and an inclined bar arranged to be in contact with said lever while said slide moves back and forward, substantially as and for the purpose set forth.

2. In a millstone-dressing machine, a toolholder, a spring which constantly forces it from the stone, a slide which carries said holder, a lever which operates to force said holderv toward the stone, and an inclined bar which acts on said lever tocause it to gradually increase its pressure on "the tool-holder during the motion of the slide in one direction, substantially as set forth.

3. In a millstone-dressing machine, a toolholder, a lever arranged to force said toolholder toward the stone, a slide which carries said holder and lever, a spring which opposes the action of said lever, and a pattern-bar which by its contact with an attachment of said lever, as the slide is fed from side to side, governs the dress of the stone face or furrows, substantially as set forth.

4. In a millstone-dressing machine, a toolholder, movable toward and from the stone, in combination with a slide which carries said holder, a leverand bar which act on said holder to prevent the diamond from leaving the stone, and a screw between said lever and bar.whereby the position of the holder with respect to the Istone may be adjusted, substantially'as set fort A 5. In a millstone-dressing machine, a toolholder movable toward and from the stone, a spring which tends to raise it therefrom, a le- IIO 6. In a millstone-dressing machine,a tool holder held constantly against the stone, a

transversely-moving slide carrying said holder,

a longitudinally-moving carriage for the slide, an inclined bar parallel to the line of motion of said carriage and adjustable vertically independently thereof, and the necessary intervening dcvices whereby said bar causes the to cut more deeply as the carriage moves totool to cut more deeply as the carriage moves toward the upper end thereof.

7. In a millstone-dressing machine, a toolholder held constantly against the stone, a transverse] ymovingslide carrying said holder,

a longitudinally-moving carriage for the slide, a

an inclined bar parallel to the line of motion of said carriage and vertically adjustable independently thereof, the necessary intervenin g devices whereby said bar causes the tool ward the upper end thereof, and an adjustingscrew for regulatingthe inclination of said bar, substantially as set forth.

8, In combination with the tooLholder slide, opposing spring and lever, and carriage m0ving at right angles to the line of motion of the slide, two inclined planes, one parallel to the 1 line of motion of the slide and the other to that of the carriage, and both combining to control the dress of the millstone as said slide and carriage are slowly fed, substantially as set forth.

9. In combination with a bed plate or frame,

a carriage,and.a transversely-movin g slide, all immovable in a vertical direction, a diamondholder and its operating-lever, both carried by 0 said slide, a transverse bar of variable inclination, a longitudinal bar on which one end of said transverse bar rests, and a device for adjustin g the inclination of said longitudinal bar,

substantially as and for the purpose set forth. 3

In testimony whereof Iaffix my signature in presence of two witnesses.

CORNELIUS S. HOOVER.

Witnesses:

J AS. P. RYoN, WM. H. BABCOCK. 

